Hi, Yes the vacuum is stronger at 2000rpm than idle. I held a cloth rag to it and it pulled it in.Not much vacuum - just a touch. Just enough to feel a little difference as your thumb is pulled off. Leave your thumb over the hole for maybe 10-20 seconds to let vacuum build up. Never quantitated it. If the hose was connected to the air cleaner and air cleaner didn't have oil in it, you may be fine on blow-by.
Also where that 3/4" hose goes into the valve cover opening, at 2000 revs there's no oil spitting out.
Is the PCV valve suppose to rattle soo much at idle, its continuously rattler.